TESTBILDSIGNALGEBER

A test pattern generator for digital television signals produces a zone plate pattern on an orthogonal pixel raster generated by pixel and line counters. The counter outputs are supplied to respective ROMs each storing a parabolic function. Their outputs are added to define zone plate circles on the...

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Bibliographic Details
Main Authors DECKELMANN, WINFRIED., 6108 WEITERSTADT, DE, RICHTER, HANS-PETER., 6301 GROSS-BIEBERAU, DE, OTT, STEFAN., 7900 ULM, DE
Format Patent
LanguageGerman
Published 11.07.1991
Subjects
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
PICTORIAL COMMUNICATION, e.g. TELEVISION
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Summary:A test pattern generator for digital television signals produces a zone plate pattern on an orthogonal pixel raster generated by pixel and line counters. The counter outputs are supplied to respective ROMs each storing a parabolic function. Their outputs are added to define zone plate circles on the basis of the circle equation x2=y2=r2. Circular patterns of evenly spaced color bars are produced by interposing a square root extracting ROM ahead of another ROM which converts the phase values into amplitude values. The optional interposition of a square root function after the addition and before the conversion into amplitude values provides a different circular test pattern. It can be readily modified in various ways under control of a microprocessor or EPROM.
Bibliography:Application Number: DE19904000359